Fluid operated tool



H. C. GUSTAFSON FLUID OPERATED TOOL Sept. 1, 1931 Filed March 5. 1928 4 SheetsSheet 1 H. c. GUSTAFSON 1,821,801

FLUID OPERATED T001;

4 Sheets-Sheet 52 Filed March 3, 1928 attozmq Sept. 1, 1931.

H. C. GUSTAFSVON FLUID OPERATED TOOL Filed March 3, 1928 4 Sheets-Sheet 3 Sept. 1, 1931. H. c. GUSTAFSON FLUID OPERATED TOOL 4 Sheets-Sheet 4 Filed March 5. 1928 m% "J M W ii w 4 A Z a o I Ml h m V M J k 6 4 W 4 27. f i r 1 [l/ r WI. A70- u 1 T u i t |1 fi u If! 7 m 8 W ii??? M aiIfHt. V I 1515553.. Ml w W 7 47 7 4 J M Y N Z Z Patented Sept. 1, 1931 rats PATET FI E I HJALMIER C. GUSTAFSON, OF DENVER, COLORADO, ASSIGNOR T GARDNER-DENVER 1 COIvIPANY, OF DENVER, COLORADO, A CGRPORATION QFDELAW'A BE FLUID OPERATED TOOL Application filed March 3,

'The inventionrelates particularly-to the means for distributing motive fluid to the piston of a rock drill or like apparatus, the object being to providea simple and effective distributing valve means for the purpose, and

as an additional feature, means for setting the'valve in a position to hold the piston the front end of its stroke and create an augmented supply'of fluid through the piston to the steel or like tool operated onthereby.

In the accompanying drawings:

Figure 1 is a side elevation of the body of a tool equipped with the novel structure,

Figure 2 is a rear elevation of the same, Figure 3 is a top plan View, Figure 4 is a cross sectional view on the line Hof Figure 3, v g Figure 5 is a longitudinal sectional view on the line 55 of Figure 2 and showing the position of the piston at the front end of its stroke and with the valve in a position to deliver motive fluid in front of said piston to drive it rearwardly, I I

Figure 6 is a longitudinal sectional view diagrammatic in its character and illustrating the piston at the rear end of its stroke with the valve in position to deliver motive. fluid behind said piston to drive it forwardly.

Figure 7 is a View similar to Figure 6, but showing the distributing valve held 1na position to hold the piston at the front end ofits stroke and with a supply of motive fluid maintained behind said piston.

Figure 8 is a detail longitudinal sectional view of the controlling valve for the distrib uting valve.

Figure 9 is a sectional view through the piston and rifle bar on the line 99 of Fig- ,ure 5.

1928. Serial 110,258,774,

tween the front end of the chamber am the rear end of the piston chamber 10. At

the front endofthe valve chamber 15V-there isprovided an annular motive fluid groove 18, withwhich communicates a sup pl'y'pa'ssageway or port 19 leading lfrom'a nippleQO formed on one thereto, a supply pipe or hose. Substantially midway of the valve chamber 15 is an annular exhaust groove 21 from which extends supply side of the barrel andsuitably constructed to have attached an exhaust port or channel 22 leading to atmosphere through a nipple 23 formed on the barrel on the opposite side to the supply nipple Between the supply groove 18 and the exhaust groove-2 1 an annular distribut j ing groove 24 'is provided, and therefrom leads a distributing by means of a port the piston chamber 10 in advance of the piston 11;. At the rear end-of the piston chamberl5 is formed an annular flange-receiving groove The rear end of'the valve casing 1% is closed by ahead 28 from which extends a forwardly projecting 'plug 29 that isdisposed longitudinally and axially within the valve chamber 15, its front end fitting into the front wall lfiofthe valve casing; The front portion of this plugis reduced in diameter to form an exhaust rece ving space 30 as hereinafter explained, and in said spaceare preferably a plurality ofoutstanding bearing lugs 31.

The usual riflebar 32 extends through the plug which is hollow and said rifle bar as shown in dotted lines has a sliding interfit ting engagement in the usual manner with the nut'of the piston 11. To this end said piston is provided with a chamber 33 that opens through the rear end of the piston so that motive fluid canhave access thereto. From the front end of this chamber 33 a passageway fl l-extends to the hammer extension 12' and is in communication withthe bore to those skilled'in the art.

Mounted on the plug 29 and located in the valve chamber 15 is a reciprocatory distributing valvei35 having at its rear end an outstanding flange 36 that operates in the flange of the drill steel or other tool, as is well known passageway 25 that opens 26 into the front end of groove 27. The front end of the valve is cut away as shown at 37 and behind said cutaway portion is a peripheral groove 38. This produces an enlargement 39 that is movable to and from a position completely across the supply groove 18. The groove 38 of the valve is also. movable to and from a position to afford communication between said supply roove 18 and the distributing groove 24. aid valve groove 38 is furthermore movable to and from a position to afford communication between the distributing groove 24 and the exhaust groove 21. Finally said valve is provided with a plurality of transverse ports 40 therethrough that are in constant communication with the exhaust space 30 of the plug 29 and are movable into and out of communication with the exhaust groove 21.

A trip passageway 41, opening into the piston chamber 10 at 42, also opens at 43 into thefrontend of the flange groove 27 in advance of the flange 36. A second trip passageway 44 opens into the piston chamber 10 behind theport 42 and at 45. This passageway 44 opens, as shown at 46 into the flange groove 27 behind the flange 36. The two ports 42 and are traversed by the piston 11, so that when said piston is at the rear end of its stroke the port 42 will be opened into the front end of the chamber and when the piston is at the front end of its stroke, the port 45 will be opened behind it. In the passageway valve, preferably this valve consisting of a stem 47 rotatably mounted in a socket 48' formed in the barrel and having a coiled spring 49 bearing against its inner end portion of said stem 47 is provided with a bore 50 that is in constant communication with the front end of the passageway 44 and a port 51 from this bore '5O is movable into and out of register with the rear end of the passageway 44. A hand crank or offset finger piece 52 is carried by the rear end of the stem and affords convenient means forturning it.

Considering now the operation of the tool, if motive fluid is supplied to the groove 18 through the port 19 and the controlling valve 47 is in open position, or as shown in Figure 6, with the piston at the rear end ofits stroke, the valve will be at the rear limit of its movement. As a consequence motive fluid from the groove 18 can flow freely around the outside of the valve and past its front end through the port 17 into the rear end of the piston chamber 10, driving the piston for wardly. Air or fluid in advance of the piston escapes through the port 26, passageway 25,. port 24, groove 38, groove 21 and exhaust ort 22 to atmosphere. As the piston moves forwardly, the trip port 45 Wlll be uncovered, whereupon motive fluid behind the piston will pass through said port, passageway 44, bore 50, port 51, rear end of the passageway 44 is a controlling inner end. The

44, port 46 and enter the rear end of the flange groove 27, thereby operating against said flange and forcing the valve forwardly or to the position shown in Figure 5. Motive fluid in the groove 18 will now be cut off from the rear end of the piston, but said groove 18 will be in communication with the distributing groove 24 because of the position of the groove 38 of the valve. Consequently motive fluid will flow into said distributing groove 44, andv thence by the passageway 25 and port 26 into the front end of the piston chamber in advance of the piston, driving it rearwardly. Exhaust now takes place behind the piston through the space 30 of the plug 29, ports 40 and exhaust port 22 to atmosphere.

As the piston runs rearwardly, trip port 42will be opened, allowing motive fluid to flow therethrough and be directed by the passageway 41 and port 43 into the front end of the flange groove 27 so that pressure is now directed against the front end of the flange and the valve is moved rearwardly. The above operations are of course repeated as long as the ports are in the positions shown in Figures 5 and 6 and motive fluid is supplied tothe tool.

If new the valve 47 is turned to its closed position, or in other words, the port 51 is moved to a position out of communication with the rear end of the passageway 44, the distributing valve will not be moved forwardly when the piston moves to its front end position and as a consequence the piston will be held at the front end of its stroke while live air or motive fluid continues to be supplied behind it. The result is that the piston is held with its extension firmly against the tool and motive fluid will find its way through the chamber 3d of the piston and passageway 44 to the bore of the tool.

From the foregoing, it is thought that the construct-ion, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

\Vhat I claim, is:

1. In a tool of the character set forth, the combination with a cylinder member having a piston chamber therein, of a reciprocatory piston in the piston chamber, a valve chamher having a supply port and an exhaust port, a plug extending into the valve chamber, a. tubular distributing valve surrounding the plug and operating within the chamber said valve having an open. end, means controlled by the valve for permitting the fluid toflow from the supply port outside the valve and past its open end to the piston having a motive fluid supply groove at its chamber, and means also controlled by the valve for permitting the exhaust to flow from the piston chamber into said open end of the valve and between the plug and valve to the exhaust port.

2. In a tool of the character set forth, the combination with a cylinder member having a piston chamber therein, of a reciprocatory piston in the piston chamber, a valve chamber having a supply port and an exhaust port that opens through one side, a plug extending into the valve chamber and having its front end reduced in size, a tubular distributing valve surrounding the plug and operating within the chamber, means controlled by the front end of the valve for permitting the fluid to flow from the supply port outside the valve and past its end to the piston chamber, the reduced front end of the valve permitting the fluid at all times to enter the space between the plug and valve formed by the reduced portion of the plug, and said valve having an exhaust port that is movable to and from a position to give access of said space to the exhaust port of the valve casing.

3. In a tool of the character set forth, the combination with a cylinder member having a piston chamber, of a reciprocatory piston in the piston chamber, a valve casing in the rear of the piston chamber and opening at having a supply port and an exhaust'port, a tubular distributing valve operating in the chamber and having an open front end in communication with the rear end of the piston chamber, means controlled by the said front end of the valve for permitting the fluid to flow from the supply port outside the valve and past said end into the rear end of the piston chamber, and means for permit ting the exhaust to flow into said front end of the valve from the rear end of the piston chamber and to the exhaust port when said end has cut off the supply of fluid.

In testimony whereof, I aflix my signature.

HJALMER C. .GUSTAFSON.

its front end thereinto, said valve casing v front end, an exhaust groove in rear of the supply groove with an exhaust port to. atmospher'e, and a distributing groove between the exhaust and supply grooves, said distributing groove having communication with the front end of'the piston chamber, said valve casing also having a flan e groove at its rear end, a plug entering the valve casing and having a reduced front end portion forming an exhaust space in communication with the rear end of the piston chamber, a tubular reciprocatory valve on the. plug movable to and from a position to out off communication between the supply groove and the rear end of the piston cham her, said valve having an external groove movable to and from an positionto connect the supply and distributing grooves, and being furthermore provided with a transverse exhaust port-movable to and from a position to connect the exhaust space of the plug with the exhaust groove, a flange on the rear end of the valve operating in the valve groove, and passageways extending from the piston chamber and controlled by the piston, said passageways opening into the flange chamber on opposite 

